Markakis will help you, definitely...so get him. Just to let you know, he, Willits, Rios, Teahen, Pence, and Utley are on the 1st place team in my league (I'm in 2nd). Pitching-wise, he has Oliver Perez, who has been very helpful this year.
Bailey might turn out good, but if he doesn't pan out in a few starts, be sure to grab penny or perez quick. Also, in a 5x5 you should consider dropping broxton for gregg or cordero.